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The Polarbear-2 and the Simons Array Experiments

  • Author(s): Suzuki, A;
  • Ade, P;
  • Akiba, Y;
  • Aleman, C;
  • Arnold, K;
  • Baccigalupi, C;
  • Barch, B;
  • Barron, D;
  • Bender, A;
  • Boettger, D;
  • Borrill, J;
  • Chapman, S;
  • Chinone, Y;
  • Cukierman, A;
  • Dobbs, M;
  • Ducout, A;
  • Dunner, R;
  • Elleflot, T;
  • Errard, J;
  • Fabbian, G;
  • Feeney, S;
  • Feng, C;
  • Fujino, T;
  • Fuller, G;
  • Gilbert, A;
  • Goeckner-Wald, N;
  • Groh, J;
  • Haan, TD;
  • Hall, G;
  • Halverson, N;
  • Hamada, T;
  • Hasegawa, M;
  • Hattori, K;
  • Hazumi, M;
  • Hill, C;
  • Holzapfel, W;
  • Hori, Y;
  • Howe, L;
  • Inoue, Y;
  • Irie, F;
  • Jaehnig, G;
  • Jaffe, A;
  • Jeong, O;
  • Katayama, N;
  • Kaufman, J;
  • Kazemzadeh, K;
  • Keating, B;
  • Kermish, Z;
  • Keskitalo, R;
  • Kisner, T;
  • Kusaka, A;
  • Jeune, ML;
  • Lee, A;
  • Leon, D;
  • Linder, E;
  • Lowry, L;
  • Matsuda, F;
  • Matsumura, T;
  • Miller, N;
  • Mizukami, K;
  • Montgomery, J;
  • Navaroli, M;
  • Nishino, H;
  • Peloton, J;
  • Poletti, D;
  • Puglisi, G;
  • Rebeiz, G;
  • Raum, C;
  • Reichardt, C;
  • Richards, P;
  • Ross, C;
  • Rotermund, K;
  • Segawa, Y;
  • Sherwin, B;
  • Shirley, I;
  • Siritanasak, P;
  • Stebor, N;
  • Stompor, R;
  • Suzuki, J;
  • Tajima, O;
  • Takada, S;
  • Takakura, S;
  • Takatori, S;
  • Tikhomirov, A;
  • Tomaru, T;
  • Westbrook, B;
  • Whitehorn, N;
  • Yamashita, T;
  • Zahn, A;
  • Zahn, O
  • et al.
Abstract

We present an overview of the design and status of the Polarbear-2 and the Simons Array experiments. Polarbear-2 is a cosmic microwave background polarimetry experiment which aims to characterize the arc-minute angular scale B-mode signal from weak gravitational lensing and search for the degree angular scale B-mode signal from inflationary gravitational waves. The receiver has a 365 mm diameter focal plane cooled to 270 mK. The focal plane is filled with 7588 dichroic lenslet–antenna-coupled polarization sensitive transition edge sensor (TES) bolometric pixels that are sensitive to 95 and 150 GHz bands simultaneously. The TES bolometers are read-out by SQUIDs with 40 channel frequency domain multiplexing. Refractive optical elements are made with high-purity alumina to achieve high optical throughput. The receiver is designed to achieve noise equivalent temperature of 5.8 μ KCMBs in each frequency band. Polarbear-2 will deploy in 2016 in the Atacama desert in Chile. The Simons Array is a project to further increase sensitivity by deploying three Polarbear-2 type receivers. The Simons Array will cover 95, 150, and 220 GHz frequency bands for foreground control. The Simons Array will be able to constrain tensor-to-scalar ratio and sum of neutrino masses to σ(r) = 6 × 10 - 3 at r= 0.1 and ∑ mν(σ= 1) to 40 meV.

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